pushing solo on a track with an aux return mutes all other tracks so you will hear NOTHING (it's logical but simply stupid)
now place modulrs great senderella on the track with aux returns as a send and put a reciving instance as insert in the master after a muted volumefader. you will only hear the channel where the send is placed.
selecting and press "f" to disable the reciving ones to hear your complete mix again.
now what would it make more easier if the reciving senderella wouldn't pass audio thru so i don't have to place the muted volumefader in front of the reciving senderella (modulr, can you please do a version with this feature of the simplified senderellas ?)
btw. senderella aren't producing latency like the t2 auxes as long as the receivers are placed on later tracks than the senders.
hmm, probably you have made the FILTER_ID by it's name 
i'll try this
)? Setup a hook to trap a certain key combo so you don't have to select the filter then press 'F' to disable the solo... 
i think all the instances, even the ones of dll's with different names, trying to use that shared memory and for a proper work the renamed dll's should use its own.