Memwatch+Arcadia
 

After setting a memwatch point in either the Arcadia BIOS or game ROM area, the whole memory bank lists 4A (m command) or 4AFC (d command) values. First non-working beta is 2700b2.

Example steps to replicate:
m f00000 (all is ok)
w 0 f00000 2 R (any address in the memory bank triggers it)
m f00000 (shows 4A4A 4A4A...)
d f00000 (shows 4AFC 4AFC...)

PS: Arcadia 2.20 firmware is OnePlay instead of TenPlay

Really quick answer: http://www.winuae.net/files/b/winuae.zip (2.7.1 alpha) probably already fixes it.

Sorry, problem is still there (winuae.exe crc32 c1fbb339).

Should be fixed now.

Yes, memory is now shown as it should. Thank you!