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: it's been a known issue in word for awhile. At least through 2003. The problem he's describing in the next version (2007) seems to be the same problem.
It may have to do with what he has open or it may not. MS is notorious for not fixing bugs ever. The MS Access exit control eat all my data bug is one. A known bug they've never fixed.
I generally run a lot of stuff at once. But the first rule in figuring out a problem is to eliminate all possibles. Closing down other programs could help...and really doesn't hurt.
Either way the problem is one that has plagued word since windows 3.1. Do a google search on word eating text and your heart will sink.
I've had word work beautifully one 500 page legal documents and eat parts of 200 page presentations. Both with no other programs and processes running and with more programs than you can shake a finger at.
Known problem. Not surprised to see it pop up in the latest version of Word.
Word...including Word 97, 2000, 2003 and 2007 don't always save when you hit save. If your harddrive is at rest for any reason...even for a second and you hit save...there is a possibility that word didn't save your work. again a know problem. I had one poor NaNoWriMo loose several thousand words this way a few weeks ago. She was using 2007.
Make sure you have the most current office service packs installed. As well as the most current windows ones. MS likes to release fixes in random places sometimes. Make sure before you install service packs that your computer can handle them. This is not always the case.
Worst case senario your os is corrupted. But this worst case and 90% of the time reinstalling the os is not the way to go. Can't stress that enough.
Event more Worst Case is your hardware is screwed in some way. Memory (ram) does die and does all kinds of wonky things.
If you plan to reinsall word...uninstall it first...completely and only thing reinstall.
But either way: Word eating chunks of large documents...long glorious unfixed history. Save multiple copies, break up a document.
And frankly almost no two PC's are setup alike. Having a lot of open programs isn't ever going to work just fine for everyone. Though I agree it should.
My current WIP is 305 pages long. Right now I'm running Word, Explorer, OneNote, Outlook and Excel. I have no problems with any of them.
I also have Symantec Antivirus running and Spybot Anti spyware running. I normally work in a Windows 'Limited' account (as apposed to an Administrator account). That prevents almost everything from getting through and messing up my PC. You would not believe (or perhaps you would) the problems I had before I learned to be careful about exposing my computer to the big bad world.
Lots of people blame their software for problems (they did exist several revisions back) when it's their corrupted computer that's the problem.