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MDK 4.14 not working with STM32 discovery / ST-Link

Hello,

I have an ARM MDK Project MDK Version 4.11 for the STM32F100 discovery eval board with ST-Link debugger. The project works on MDK 4.11 but not all peripherals are available in the debugger like Port C which I wanted to debug. Then I upgraded to MDK 4.14. Now things are even worse.
When I start the debugger I get the message "Memory verification error", then "Error while attempting to write 4096 Bytes to 0x08000000". After that the debugger starts and the disassembly window shows that the PC is at address 0x08000134. But I wanted it to be at main() + in the peripheral window even less only the Core Peripherals are available.
I have checked the Debug and Utilities settings and made sure the ST-Link Debugger is selected + recompiled the whole project - no success !!!
I switched back to the old MDK 4.11 - everything works like before, so the project file is O.K. I guess.

What now - can anybody help - please?