diff --git a/VERSION b/VERSION
index 75a75e3..09b2c06 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.2.6.3
+0.2.6.4
diff --git a/docs/manual/build/classroom-manual.html b/docs/manual/build/classroom-manual.html
index 85aa143..936de39 100644
--- a/docs/manual/build/classroom-manual.html
+++ b/docs/manual/build/classroom-manual.html
@@ -142,10 +142,13 @@ figcaption { color: #93a5aa; font-size: .9rem; margin-top: .4rem; }
If Wonder Ink says a picture *could not be taken from the page*, it had not finished loading: close the preview and try again, or choose Print page… to print the whole page instead.
Click Print. Wonder Ink says when the printer has it and goes back to the lesson. Cancel prints nothing.
Worksheets and colouring pages
-Click the worksheet link in the lesson. It opens in a new tab, ready to read or print. A worksheet's own − and + at the top of the page make it bigger or smaller.
+Click the worksheet link in the lesson. It opens in a new tab, ready to read or print. Any other link in a lesson — a slide, a picture, a video — also opens in a new tab with one click, and Wonder Ink shows it straight away; the lesson stays open in its own tab. A worksheet's own − and + at the top of the page make it bigger or smaller.
Worksheets you download are kept separately from everything else on the computer, so they never get mixed up with anything.
+If Wonder Ink closes by accident
+Open it again. If you used it in the last two hours, your recent tabs come back — the slides, pictures and worksheets you had open, in the same order. Wonder Ink's own lesson tab comes back at the sign-in page: sign in again and open your lesson.
+Your password is never kept. After two hours that nobody has used Wonder Ink, it forgets the tabs and the next person starts with a fresh Wonder Ink.
When you have finished
-Close Wonder Ink at the end of your session. Closing it signs you out, so the next teacher in this room starts with their own account and not yours.
+Close Wonder Ink at the end of your session. Closing it signs you out, so the next teacher in this room starts with their own account and not yours. Your recent tabs are kept for two hours in case you need them again, but never your sign-in.
Back to the top
diff --git a/docs/manual/build/classroom-manual.pdf b/docs/manual/build/classroom-manual.pdf
index 1720f0d..8b5cdaf 100644
--- a/docs/manual/build/classroom-manual.pdf
+++ b/docs/manual/build/classroom-manual.pdf
@@ -209,7 +209,7 @@ BT /F1 10.5 Tf 1 0 0 1 62.0 203.4 Tm (Download it again. Your original download
endstream
endobj
21 0 obj
-<< /Length 4359 >>
+<< /Length 4396 >>
stream
BT /F2 17 Tf 1 0 0 1 62.0 774.0 Tm (Wonder Ink) Tj ET
0.75 w 0.6 0.6 0.6 RG 62 751.9 m 533 751.9 l S
@@ -251,18 +251,27 @@ BT /F1 10.5 Tf 1 0 0 1 62.0 203.9 Tm (close the preview and try again, or choose
BT /F1 10.5 Tf 1 0 0 1 62.0 184.0 Tm (Click Print. Wonder Ink says when the printer has it and goes back to the lesson. Cancel prints) Tj ET
BT /F1 10.5 Tf 1 0 0 1 62.0 169.1 Tm (nothing.) Tj ET
BT /F2 12.5 Tf 1 0 0 1 62.0 141.2 Tm (Worksheets and colouring pages) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 120.5 Tm (Click the worksheet link in the lesson. It opens in a new tab, ready to read or print. A) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 105.6 Tm (worksheet's own ? and + at the top of the page make it bigger or smaller.) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 85.7 Tm (Worksheets you download are kept separately from everything else on the computer, so they never) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 120.5 Tm (Click the worksheet link in the lesson. It opens in a new tab, ready to read or print. Any other) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 105.6 Tm (link in a lesson - a slide, a picture, a video - also opens in a new tab with one click, and Wonder) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 90.7 Tm (Ink shows it straight away; the lesson stays open in its own tab. A worksheet's own ? and + at the) Tj ET
endstream
endobj
22 0 obj
-<< /Length 379 >>
+<< /Length 1446 >>
stream
-BT /F1 10.5 Tf 1 0 0 1 62.0 780.0 Tm (get mixed up with anything.) Tj ET
-BT /F2 12.5 Tf 1 0 0 1 62.0 752.1 Tm (When you have finished) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 731.3 Tm (Close Wonder Ink at the end of your session. Closing it signs you out, so the next teacher in) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 716.4 Tm (this room starts with their own account and not yours.) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 780.0 Tm (top of the page make it bigger or smaller.) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 760.1 Tm (Worksheets you download are kept separately from everything else on the computer, so they never) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 745.2 Tm (get mixed up with anything.) Tj ET
+BT /F2 12.5 Tf 1 0 0 1 62.0 717.3 Tm (If Wonder Ink closes by accident) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 696.5 Tm (Open it again. If you used it in the last two hours, your recent tabs come back - the slides,) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 681.6 Tm (pictures and worksheets you had open, in the same order. Wonder Ink's own lesson tab comes back at) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 666.7 Tm (the sign-in page: sign in again and open your lesson.) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 646.8 Tm (Your password is never kept. After two hours that nobody has used Wonder Ink, it forgets the) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 631.9 Tm (tabs and the next person starts with a fresh Wonder Ink.) Tj ET
+BT /F2 12.5 Tf 1 0 0 1 62.0 604.0 Tm (When you have finished) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 583.2 Tm (Close Wonder Ink at the end of your session. Closing it signs you out, so the next teacher in) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 568.3 Tm (this room starts with their own account and not yours. Your recent tabs are kept for two hours in) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 553.4 Tm (case you need them again, but never your sign-in.) Tj ET
endstream
endobj
23 0 obj
@@ -385,15 +394,15 @@ xref
0000007188 00000 n
0000011325 00000 n
0000014467 00000 n
-0000018879 00000 n
-0000019310 00000 n
-0000020838 00000 n
-0000022391 00000 n
-0000023610 00000 n
-0000025429 00000 n
-0000025527 00000 n
+0000018916 00000 n
+0000020415 00000 n
+0000021943 00000 n
+0000023496 00000 n
+0000024715 00000 n
+0000026534 00000 n
+0000026632 00000 n
trailer
<< /Size 29 /Root 1 0 R >>
startxref
-25630
+26735
%%EOF
\ No newline at end of file