This is fixed in AFS 1.4.
RMTarget, as supplied in AFS 1.2 and AFS 1.3, uses a sequence of instructions that accesses banked registers after a forced user-mode STM. To fix this, you must add a NOP as follows:

1) In the Sources/rm_asm.s file, locate the following code in the rm_PollRunningToStoppped function:

         STMIA   lr, {a1,a3,r5-r14}^ ; Save user-mode r3-r14.
         ADD     a1, lr, #12*4       ; a1 points to r[15] 

2) Insert a NOP instruction as follows:

         STMIA   lr, {a1,a3,r5-r14}^ ; Save user-mode r3-r14.
         NOP                         ; need a 1 instruction gap before reading lr
         ADD     a1, lr, #12*4       ; a1 points to r[15] 

(DE 63660)