As a point of interest, Peter, did you have the machine delivered and installed by Bionicasystems? If so they should have done some test cuts to check and adjust alignment.

If it was initially aligned, then you have probably knocked it out by cutting hard materials (like cold butter).

Looking at their web site they seem to have two ranges of machine, the ali profile and meccano ones and some that look like they definitely never built them, huge ones with sheet feeders etc. I'd hate to be an industrial user buying one of those and finding it wasn't up to snuff. Their aftercare seems to leave a large gap between expected and actual.