I just noticed that as time goes by, more and more TCC tasks are running (unattached to TCMD). Any idea where these are coming from? My guess would be that they are transient tasks (for example, for piping) that for some reason are not terminating.
They attach just fine, and I can then use them. One extra fact: they are always in the initial directory, just as when I open a new instance manually and TCSTART runs. That probably rules out pipes (which I don't use often, at least not explicitly).
I should try to remember to run my tasks.btm more often so I have a better idea of when they appear. I don't have any new ones now.
I have not been having the problem recently. I suspect that it is associated with some BTM file that perhaps has a defect that allows it to quit before something that invokes a new instance has finished. The most likely culprit is a very complex BTM file that implements a mailmerge with HTML email messages and a data file with addresses and other information to be merged.