You should not need to re-install before patching.
The 'corruption' is saving the game and missing the world/shroud files. After quitting Dinvinity and re-starting, when the game tries to load that save and finds those files missing, it uses the default files, which are what will be used for any subsequent saves. Reverting to a point where the problem had not occurred after installing the 1.34 patch will ensure this does not happen again.
