I have a spreadsheet with LOTS of process charts using the drawing tools.
They've always worked perfectly. Recently, the symbols will not re-draw. If I
click on the symbol, it re-draws. If I click on all the symbols and make each
of them re-draw, previously drawn symbols will start disappearing. The text
in the symbols always appears. I thought it might be a memory issue, although
they were displaying before. Upgraded to 1MB of RAM - no effect. Thought it
might be file size, although it's only 2MB and I've had 5MB files before
without issue. Trimmed file size down to 1.5MB - no effect.

Any idea as to why the symbols aren't re-drawing consistently?