Erik Deppe is already aware of the problem (seeking operations during TRT) and it will be fixed in the next CDSpeed version (which seems to take longer than expected).
Erik Deppe's post
at CDFreaks about this problem.
(in English) about this problem at CDFreaks.
Pioneer DVR-112L, LiteOn SHM-165P6S, Pioneer DVR-111L, BenQ DW1655, Plextor PX-760A
LiteOn LH-20A1P, Optiarc AD-7203A, Matshita UJ-840S, Sony RDR-HX910, Sony RDR-HX750