Good info, I guess it's not your strategy. And you're running OQ2014 (I think), which I have no experience with.
At least with my old version, adding and removing instruments from the Quote Monitor (or more common for me, to the real-time data importer) can be tricky and can cause errors. With the data importer, I'm always careful to only add/remove symbols when the data collector is not monitoring, else I get errors (maybe something like yours). Removing seems to be more of a problem.
The quote monitor doesn't have a button to start or stop it, so its behavior might be different. But my working theory is that both of them are monitoring, and they might be sharing some code to manage the list of symbols being monitored. All I can suggest is that you not remove symbols from the monitor. Instead, close the monitor and add the symbols back.
If it consistently happens after rebooting OQ, and if IB EURUSD is the first symbol being monitored, another long shot idea is that it might be in the instrument definition. Maybe the AltId group values are not right, or something like that. I'm sorry I can't be of more help.
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