AndroidMoo
Member
lots of bugs coud happen. cache is a temporary holding place of data. you need to wipe both dalvik cache and cache among others in order for you to flash a rom. a rom needs a very clean environment to install into. the cleaner the better.
not familiar with marketfix as to what or how it moved cache. but you should be fine by a normal wipe in recovery and flashing a rom. just make sure that you do a nandroid backup first.
Would flashing a new rom make a new cache in internal memory and the cache on sd card would just be unused stuff?