Overclocked my N900 to 800mhz, and all was good - or so I thought.
Noticed that Picodrive and Angry Birds was stuttering slightly.
Then ran Sygic Mobile Maps up and it now crashes everytime I get a lock (i.e. map changes to navigate colours).

Was on latest UK Black firmware, and flashed back to 'stock' 600mhz speed - still same three problems.

Decided to do a fresh install so followed instructions but flashed the latest 'Global' firmware - still have same three problems.

After searching the forum/s, seem to be on my own with this problem - so wondered if flashing the eMMC would help before a fresh install of firmware.
Problem is I see When flashing the eMMC content, always flash the FIASCO/Rootfs image first, then the eMMC. Do not boot up the device between the two!, but no other download or process to follow to do this - am I missing something really obvious ?

Any help/guidance would be greatly appreciated, or any other thoughts / suggestions as to why I now get the above three problems ?