3.51 M33 Custom Firmware is too new. I recommend you downgrade back down to a lower firmware until someone figures it out. Or if you can figure it out, let us know.
Edit: Just upgraded from 3.03 oe-c to 3.51 M33-6 and all is running great! Used same configurations as what was in the 3.03 FW and am using Psp-290. Kernel is set to 3.51 and MapViewer is in the GAME351 folder. Not sure what .prx version I am using, though.
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