I have been having this problem for a long time... Often, for no apparent reason, my cropped, detail, or broken  views will disappear.  Sometimes I'm able to get them back by going in and editing the crop boundary, or by making sure that all lightweight features are resolved.  Sometimes, however, nothing I do will fix it and I have to either close without saving and hope that I can use this clunky method of resetting my drawing to an earlier time, or I must delete the view.  This is frustrating.  I'm running SW 2007, so maybe some of these bugs are fixed in later versions, but as I'm on the brink of upgrading half a dozen seats to the latest one, It's hard to make the decisioni to do so when certain fundamental features of my old version do not function properly.

Has anyone else had this problem?

Here are some reference posts from people with seemingly similar issues:

https://forum.solidworks.com/message/110549#110549Looks like the same problem... no answer to this post

https://forum.solidworks.com/message/206474#206474 - Similar problem (for reference sake) but not exactly the same

https://forum.solidworks.com/message/238621#238621 - Similar problem... answer is that it's a driver graphics card driver issue... maybe true for me too, but I keep these up to date.  I'll check into it.  Still any other ideas would be helpful.