Strange Behavior when Switching from/to Library

Some annoying behavior has presented itself in my copy of iTunes. It didn't used to work this way but now when I've made a selection in my Library (say an band or a particular album), click play, then switch to some other source (say the Music Store), then switch back...my entire Library is shown...not the selection I had just made.
So instead of being in Genre (All), Artist (Galaxie 500), Album (All), for example, iTunes switches me back to Genre (All), Artist (All), Album (All).
This is really annoying and only started happening a month or two ago.
Any ideas?

Thank you for the swift replies.
After Bill asked about the ID Query, I decided to try a few things that I had already gone over just to double check. I was suspspicious that timing was the source of the error. Using a timed while loop, I set the wait time to 10 seconds and got results. As it turns out, 5 seconds is not long enough, but 8 seconds is a sufficient wait time for the program to work. With the problem solved, I am still mystified as to why waiting 8 seconds is required.
I think that the oscilloscope must be given sufficient time to display the signal on-screen before the Start Aquistion or Get Waveform functions are used. With this logic in mind, the breakpoints were acting as a sort of wait, allowing the signal to be displayed before continuing through the program.
In response to Jeff, I am indeed using an external direct trigger. The hardware is sound, but apparently, my coding could use some work.
I have attached the modified code. I am certain that there is a more elegant solution to the timing than simply slapping a timed while loop on the code. Any suggestions?

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