Teleporting u-boat (No, not "return to base")

[Type XXIII]

First of all, I'm using IuB 1.02 and SH3C.

Returning from a patrol off Gibraltar with my IXB, I dock at Wilhelmshaven 13th August 1940. I close SHIII. Next day I open up SH3C and launch a new patrol. I'm told I now have a new base, Lorient. (Since the calender passed into september while at port.) Everything's fine so far. I leave Wilhelmshaven. Now, during said patrol, I experience a power outtage and lose my progress.

When the power gets back, I start up SH3C again and launches the same patrol again. This is where something goes wrong. The briefing says no patrol area, but tells me to leave Wilhelmshaven and dock at Lorient. But, when I launch the patrol, I again get the message that I have a new port, Wilhelmshaven. (Weird, I think, I'm there, aren't I?) When I get into the game, I'm not at Wilhelmshaven anymore, but docked to the supply ship in Ceuta, (which I had been using during earlier patrols) and the date is 14th August.

Somehow, the game has assumed that since I'm not in the right port (Lorient), I must have docked in a wrong port. Furthermore, it assumes that this wrong port is the usual wrong port, namely the supply ship.

Does anyone know how I can get my boat back to Wilhelmshaven and start a patrol from there (without sailing there in game) ?