Always:

List your HBOOT version and "S" status. If you did, ok. But, I didn't catch it.

Also, list what steps you have taken.

VERY first thing:

1) Wipe cache, dalvik, factory reset, and flash modified superwipe (I've done this and in doing so have had no flashing issues. All my issues were because of something I missed or messed up).

2) Have you tried going back to a GB ROM? If so, how? Did you do a restore or a clean wipe and flash?

3) If you did a restore, did you do a complete wipe as stated in #1?

4) After flashing an ICS ROM, were you trying to restore any data from a previous ROM, whether GB or ICS?

5) If trying to restore data from a GB ROM, it will bork your ICS like it did for me, regardless of the ICS ROM.

6) If trying to restore data from an ODEX ROM to a DEODEX ROM, or vice versa, it will bork stuff.

Just let us know what was done and that will eliminate a lot of repeated suggestions.

EDIT: I'm running Booster Shot ICS with no issues or force closes. I've easily flashed my phone to different things over 50 times. Completely wiping everything like I stated in #1 has always worked for me and prevented issues in coming from a different ROM. Sometimes if you skip a wipe, it will leave remnants of the previous ROM (from what I was told and it has seemed to prove true in my cases).

wipe

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sounds like a wipe issue. I've used several ICS roms with no issues.. Try SuperWipe by mikey and see if that helps. Also, not all recoveries will propperly install all ROMs, I'm using 4ext right now and seems to work well

Gotta Learn the proper wiping techniques.... Only fold it twice...

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