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ULINKPRO download/verify fails on STM32F072, but works with STLINK

I have a STM32F072 (Cortex-M0) and can't load a appliaction using my ULINK PRO. The same project works with STLINK perfectly.
The download runs, but fails during verification at some random addresses.

I have been using the ULINKPRO-D for almost 2 years without trouble on many other projects.

I already cross checked:
1. Using a different target platform. a) It works every time I use the STLINK/V2, it never works using the ULINK PRO b) It works with both the STLINK/V2 and with the ULINK PRO, if I use a different target (e.g. STM32F407)

2. I also setup a new empty project for the STM32F072R8, same results.
3. I use the same FLASH algorithm in both cases.

I Use the following software:

- Keil MDK-ARM Plus 5.23
- No Packs (for the simple prove of error)

I have no idea. Is my ULINK-PRO-D defect?

Regards