Pb with "Erprobungsstelle Kiel"
 

Hi,

I play Living Silent Hunter 5.1. 7th flotilla St Nazaire, mission 20, on 17th october of 1941. My submarine is VIIB.
I received many messages from Kiel, during missions, to inform me that new model VIIC is available. I have 59000 reputation points and my career is in october 1941.
To change my submarine in VIIc, I was told to go to "Erprobungsstelle Kiel". So I decided to do it in July 1941, with a previous completed mission, to be ready with new VIIc for the October 1941 mission. So I loaded the previous mission, "at the base after mission" on the 25th July 1941. I handed out medals and applied for transfer to "Erprobungsstelle Kiel". But the game crashed with a error report, each time.
So I tried to load the previous completed mission on the 25th july 1941, handed out medals, start a new mission on August 1941 and immediately returned to base without having complete the mission (no 24h patrol) to not spend time. Then I applied for transfer "Erprobungsstelle Kiel" : a message appeared "your home-base has changed" but when I clicked on "OK", nothing happened. The message stayed still on my screen and I couldn't close the window or return in the game. I had to quit the game with hard command "CTRL-ALT-SUPP". I tried several times but same problem appeared.
I must tell you that 1 month ago, I reinstalled an old system copy (system copy of April 2013) because of new graphic card. Then I replaced the Career files with the newest which included the latest completed missions. But the 3 latest were corrupted and didn't appear in the list. So I restarted these 3 missions and my career is now in october 1941. I tried several times to change my submarine before, but I didn't know the correct way to do this.
Since yesterday, with help on this forum, I tried to transfer to the "Erprobungsstelle Kiel" to buy new VIIc submarine and I try to do this transfer in July 1941 in loading this previous completed mission "at base after mission" (more convenient for me to change submarine after this July mission. If I change submarine after the October mission, I'll spend too more time and I won't be ready for the next special November mission).

Can you help me? What's wrong? I woudn't like to reinstall the game and restart a new career...
Thanks in advance for your help!
Have I to go to the Base Kiel? Could you help me?