Script behaving differently on different portal rows

[JonAgnew]

I have a script that mimics a GTRR. The button is located in a portal row. Basically, the script sets a variable to the record ID for the portal row, then navigates to an unrelated TO, finds the desired record, then shows all. Except that it doesn't work on all the portal rows. On some rows, the show all step doesn't work. Anyone have any ideas?