Il-2 Sturmovik: Cliffs Of Dover Retail Patch v 1.01.14550

[Zappatime]

Since this latest Steam patch and hotfix, I've had the following new problems:
1. concrete coloured rectangular strips on the sea texture - never had this before but seen it on others' screenshots;
2. prolonged (5 mins or so) drop in fps during a small mission (4 planes only) after going to outside view of an enemy then returning to cockpit view, over sea, fps dropped to 6-7 fps, I normally have between 40 - 80 fps in usual circumstances.

[Earlier this week I updated my driver to nvidia's latest beta 275.27 W7 64bit, but not seen any oddities in other games so far]

3. no sound until about 10 minutes into a mission, thereafter certain sounds intermittant or missing completely - again never had missing sound in an actual mission before, only in the known issue with track replays and sounds that have never been there as far as I know (e.g. train sounds) ;