with intensity over 12 i reiceve only hw errors 
I have the same problem, 
I can see people using the option --scrypt-vert?
I can't see it with vertminer --help, only see the option --scrypt or --nscrypt...
anyone can help us
Changing the algo wont help you get accepted shares (i.e. the --scrypt option). Different versions (vertminer or GCminerAleks) have different options I think.
I get this HW error problem on my R9 270 when I have -g 2. When -g is set to 1 I can run much higher intensities and TCs (12288 seems optimal for me). If I push it I can get about 200 kh/s but generally running at about 195 kh/s.
Anyone have a compiled version of vertminer 0.5.4 for windows? Also, what's new in it?