Breakpoints not working properly

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I was using Insight (x compiled for target ARM on host Windows NT) for some time without any problems until I set a breakpoint for example at _main . GDB crashes (exception) and produces a stackdump (see below). Occasionally it is working alright. What's causing this problem ?

     96    1132 [main] arm-elf-gdbi 1000 exception: trapped!
4082    5214 [main] arm-elf-gdbi 1000 exception: code 0xC0000005 at 0x4E5BE2
1943    7157 [main] arm-elf-gdbi 1000 exception: ax 0x0 bx 0x1 cx 0xA17ADEC dx 0x299DDF4
1831    8988 [main] arm-elf-gdbi 1000 exception: si 0x1 di 0x299E008 bp 0x0 sp 0x299DDE0
3953   12941 [main] arm-elf-gdbi 1000 exception: exception is: STATUS_ACCESS_VIOLATION
1810   14751 [main] arm-elf-gdbi 1000 stack: Stack trace:
1848   16599 [main] arm-elf-gdbi 1000 stack: frame 0: sp = 0x299DC04, pc = 0x6100AE63
1915   18514 [main] arm-elf-gdbi 1000 stack: frame 1: sp = 0x299DC30, pc = 0x77F96666
3374   21888 [main] arm-elf-gdbi 1000 stack: frame 2: sp = 0x299DC54, pc = 0x77F8912B
1968   23856 [main] arm-elf-gdbi 1000 stack: frame 3: sp = 0x299DCE0, pc = 0x77F763BA
1921   25777 [main] arm-elf-gdbi 1000 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
1962   27739 [main] arm-elf-gdbi 1000 handle_exceptions: Error while dumping state (probably corrupted stack)