Bit of an odd one i was wondering if anyone else has seen.

I have user who for some reason finds that a spreadsheet he has been working
on all day, dissapears from the task bar.

Tries to re-open it to find that its already opened by him.. hence why i got
a call.

Closer inspection i find that excel is still running. Kill the explorer.exe
process and reload it and it reappears.... pretty odd

I was wondering if anyone has seen this at all ?

System is WXP Pro SP2, Office 2003 SP1

Any Help appreciated