Nostik: well...i buyed DD in a shop not from GOG...
That explains the corruptions. You may be able to find patches for the retail copy on-line but I don't believe the V1.005A patch is available for a retail game.
My best suggestion, other than patch it to the newest retail patch available, is to buy the
GOG release . It is patched to V1.005A and has the minimum bugs / problems of any release available. The saves from a retail game cannot be used in the GOG release so you would have to start a new game but . . . it will play sooo much better . . . =)
Edit:
This may be the last retail patch (1.0034A) available, check for higher versions.
Edit: It appears that the only fix the 1.0034A patch applied is for the problem you have. Applying the 1.0034A patch may solve your problem for the retail copy.
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Bugfixes addressed in V1.34
-Solves the black map/resetted world problem