OldOldGamer: Aside repackaging the original (or patched) version with all their pro and cons... usually alongside issues on running on newer systems, nothing is done.
You should have seen how this game looked before we "done nothing" :-)
OldOldGamer: 30 PC in the test lab (assuming identical HW and SW they are nearly useless for testing purposes), where Silver run as a charm but, in a few hours, many customers encounter the same problems that solved in the same manner: a community solution.
As TET said - this is a problem of different PC configurations, OSes, codecs etc. There is no way to predict every possible problem on every possible configuration. We try to make sure, that our games have no problems on their own, and no problems on all modern configurations we can test them on. And for most users they actually work.
For others, we have the support. I just posted a possible fix for Silver access violation problem, 22 hours after it was reported on the forum. And in this case, it is not "broken game", but most likely a codec issue, which means it depends on user platform. If it doesn't help, we'll work from there. Have some faith in us, people :-)
timppu: That raises again the important question: should GOG release only games that are guaranteed to run perfectly on all setups that they can think of?
Is there actually any game that ran on every PC out of the box without any problems? Besides we do - "every setup we can think of" is called the test lab :-)