Gap playing back a loop on Reference track

Not sure if this has to do with a certain plugin yet (might be latency related) but has anyone experienced a short gap of silence when listening to a reference track when cycle is enabled?

Playing back on the normal tracks is fine.

Tried to use MetricAB as an alternative but that doesn’t seem to sync correctly.

Ok seem to have narrowed this down to Metric AB being on the playback section. Took it off and all fine. It uses a large latency if you want to sync the playline to audio so that was probably the reason.