I will examine this and post more symptoms.
There is one thing slightly related to this, check this file:
(click "Raw" to download binary CTM).
it is CTM 8, text mc, with tiles. Charpad 3.0 BETA#3 shows three tiles with tags 0, 0, 4 respectively. But it fact it is 0, 2, 4 (it is how it is stored in CTM file, I'm pretty sure about it. By some reason, tag for second tile is shown as 0.