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I recently started using the latest ja-dcpu and upgrading to DCPU 1.7, and I ran into problems with assembling code that used to assemble correctly. I've boiled it down to issues where arguments considered valid in "a" position yield an error when in "b" position. Here are some examples:

; These work
    set A, [Y + 65535]
    set A, [Y + -1]
    set A, [65535 + Y]
    set A, [-1 + Y]
    set A, [-2]
    set A, [65535]

; These do not work
    set [Y + 65535], A
    set [Y + -1], A
    set [65535 + Y], A
    set [-1 + Y], A
    set [-2], A
    set [65535], A

I'm getting invalid assembly output for SET [0 + J], A when compared to SET [J + 0]. The following code illustrates the problem:

SET [0 + J], A
SET B,B
SET [J + 0], A
SET B,B

Disassembling the output gives this:
SET [J+0x0411], A ; [0000] = 0171 '.' 0411 '.'
SET [J+0x0000], A ; [0002] = 0171 '.' 0000 '.'
SET B, B ; [0004] = 0411 '.'

The first instruction did not output the 2nd word for the literal 0, and it seems to have eaten the second instruction. Writing the operand in the other order (J first) seems to output the result correctly.

I get an error when trying to assemble any of the following statements:
SET A, [SP]
SET A, [--SP]
SET A, [SP++]
SET A, [SP + 1]
These are PEEK, PUSH, POP, and PICK n, respectively, which all work correctly.

I was able to work around the issue by using the latter forms, but it seems the earlier forms should be usable as well.