dmd / optlink crashes

[Saaa]

I never had any compiler crashes with D1
With (newest)D2 the compiler seems to crash a lot (with most of the time 
incorrect code).

Faulting application dmd.exe, version 0.0.0.0, faulting module dmd.exe, 
version 0.0.0.0, fault address 0x0001cb20.
and 0x000678f6.

Now Optlink also unexpected terminates.
(not sure whether it is also my fault somehow :)
Unexpected OPTLINK Termination at EIP=0040E0DE EAX=011A000 EBX=00431D10 ECX 
00000408 EDX=000008DE
ESI=845511F5 EDI=011A2FE0 EBP=0012FFF0 ESP=0012FF58
First=00402000
(sorry can't read this myself XD)

The problem seems to be in:

struct Linput
{
 //bool[10][10] code; //uncomment equals OPTLINK crash
 byte[10] data;
 ubyte position;
}