AVR-Chat

I am playing with AvrStudio.  I have a cheap JTAG-ICE debugger that I
bought on ebay.
	 Item number: 300240185362	

The only way I can get this to hit a breakpoint [when in a loop] is to
do the following:

		if(count >250)
			count = 0;  [breakpoint here]

Count is a loop counter.  If I reset the value of count to any
non-zero value, the breakpoint doesn't work.

Also doing the following doesn't work:

	if(count >250){
			count = 0;
			marker = 1;  [Breakpoint here]
			}

Again, the only way I can get the breakpoint to consistently work is
to code it as:

if(count >250)
count = 0;  [breakpoint here]

Just curious as to why this happens.

Should I buy a better JTAG-ICE?  Should I use something else to debug
software?  Thanks for your input.

Cheers,

David