isis and pic simulation problem

[shadowkane]

well i don't know what it happen but i hape a problem with isis,after writeing my program bu mikro c and it's simple one, just click in the button the led will lights that's is but i use pic 16f887 nut just a button and led, so this it the condition (if (porta.ra0==1) { portb.rb0=1 } else portb.rb0=0 that's all and it's workin mikroc when i debug it step by step but in isis it don't work, i tried to know the problem i use this condition if porta=0x00, that was the only one that work, even i tried porta=0xff but it didn't work, so i want to know what it the problem with isis, if any one can help me with, by the why, i wasn't have that problem only those day it starts, and i installed in new windows but it's the some thing :/