All, The RSID feature in Fldigi seems to work very well. It can be setup to search the entire pass band for incoming RSID's. Just remember to click the RSID button in the upper right-hand corner to activate it. The green light means it's armed and ready for RSID reception.
Fldigi will automatically switch to the mode that corresponds to the RSID being sent. For example: if the Tx station transmits CQ in MFSK32 mode with RSID, your software will automatically change to that mode providing you have the RSID activated and ready. Very useful during Mode Madness Hour! Both Multipsk and Fldigi have this feature. Tony -K2MO