We just figured out what's going wrong with the latest patch and have created an updated version of the patch which we released this evening.
The official announcement will come on monday, but if you go now to the support section and download the patch which is marked as v1.33 you will in fact be downloading v1.34 which solves the black map/resetted world problem. The following applies:
If you apply the updated patch and load savegames made prior to v1.33 you will encounter no more problems.
If you had loaded savegames made with v1.33 after starting a new game with v1.33 you will also not encounter any problems.
If you have made a savegame in versions before v1.33, then loaded that savegame in v1.33 and saved in v1.33, that savegame is potentially corrupt. The best thing is to revert to one of the savegames made earlier with v1.32 or before.
We're really sorry about any inconveniences/frustration caused by this but are happy that we could solve it relatively quickly. Thank you to all of you who sent in your savegames and helped us locate the bug.
Lar