I'm going to start referring to it as the 'toyota effect'. There seems to be a problem somewhere but it's almost impossible to reproduce the problem when trying to fix it.
It's complained about enough that there must be something to it, yet some of it just seems to be 'user error'. (clean out your cache, cookies... upgrade your computer when possible)
If you can take a screen shot, or at least send me an email about it (details such as your O.S., error message, etc) We might be able to pinpoint the problem with more luck.
I wish I could be more help than that.
Thanks.