I've had a similar experience inthe past. What I did was every time there was a bug reported in a screen I took that opportunity to rewrite that screen. It spread out the cost of a rewrite and over time the code got a lot more stable. Well worth it in my opinion.

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>No wonder this application behaves unpredictable. However, how I'm supposed to fix problems / bugs with it? If I try to change one little piece of code, I would not know what is affected - results of my change could be.
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>BTW, when I ran this application in VPME and checked developer's info, I found the name of the developer. I searched VPM Newsgroup and found several of his questions there few years ago. The questions all seem to be OK.
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>I'm just wondering how such applications can be written and more importantly - maintained later.