Catastrophic effect of a corrupt image

[Graham Samuel]

Just in case this happens to other listers, I thought I'd mention that I 
have had a problem with one of my apps for a very long time, in that 
although it runs on Macs and on PCs with XP (and probably 2000 and NT), it 
won't run on PCs with Windows 98 or ME (there are plenty of these still 
around). The program halts while starting up, either with an illegal 
instruction or a resource crisis.

This problem has just been **solved** for me by the RunRev support team, 
and the cause was a corrupt image file (originally a GIF), which was still 
displaying correctly in some OSs, but caused a crash in the others. I had 
no way of detecting this myself (since it was just one of a hundred or so 
images, all of which looked fine in my own test environment - and I have no 
understanding of the innards of either Windows or the RunRev engine), but 
if ever the same symptoms crop up, I'll know what to look for. I have been 
advised that PNGs are 'safer' than GIFs, so in future I guess I will be 
using more of them.

HTH someone now or in the future

Graham

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Graham Samuel / The Living Fossil Co. / UK & France