Are you using any CA correction?
Probably a bug in the librtprocess RCD implementation. @Carmelo_DrRaw could you try this branch please?
https://github.com/CarVac/librtprocess/tree/rcd_speedup_new
I ported the latest code from RT to this branch about two weeks ago.
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@Iain It happens either way. You could give it a closer inspection if you wish. The last update was in August and can be found here.
I forgot about the bug and kept on using the RCD in PhotoFlow… 
@Carmelo_DrRaw Is it on your to-do list?