Often but not always, when saving a number of files to a workspace (.xlw)
file, get error message 'Excel has encountered a problem and needs to close'.
When this happens, it closes and automatically deletes any previous xlw
file. When it re-opens and recovers the files, if I try again to save
workspace the same message appears and Excel closes as before.

This doesn't seem to happen with just a couple of files, but anything from
around 8 upwards, and file size doesn't matter (no reason why it should, the
xlw file is just a record of links to actual files isn't it?)

The only temporary workround seems to be to close all of the files down and
re-open them individually, then save workspace, but htis doesn't work every
time - the same problem comes up.

Re-starting the PC doesn't make any difference either.