OclHashcat 1.21 closes without any message

I have recently installed latest 64bit version of OclHashcat 1.21; however, it is not working. Whenever I start hashcat it closes without any error message only posting:

"oclHashcat v1.21 starting...
Generating bitmap tables..."

And quits.

When I try to run benchmark it does the same except the output looks like:

"oclHashcat v1.21 starting in benchmark-mode..."

when I try using 32bit version it crashes with the following error:

"The exception unknown software exception (0x0000417) occurred in the application at location 0x530c55a4."

Can anybody help?

My spec:
AMD Radeon HD 7970 Ghz
Catalyst 14.4
Driver packaging ver 14.10.1006-140417a-171099C
OS: Windows 7 pro 64bits
I have removed completely driver and OpenCL dlls, reinstalled them and still nothing. Previous version of Hashcat was working perfectly fine with earlier catalyst version. After driver upgrade it stopped working so I have updated ocl hashcat to 1.21.
Allright, I have solved it. HIPS was preventing hashcat from running. apologies for false alert.