Situation:

I clicked on a planet -> clicked on covert operations -> selected Destroy Units and hit "Go".

Result:

    Military Advisor
"Good news. At this time we still have 4 Special Operations at our disposal."

You have destroyed 0 Droid at the target.

Your agent network allows you to send out agents to disrupt the enemies activities. An agent action would currently cost us x cash.
You have x agents available.

You don't know any agent operations.
Wizards can use their mental abilites to affect your enemy or your own empire. A magic action would currently cost us x octarine.
You have x wizards available.

You don't know any wizard operations.

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So what happens is that the textboxes to input planet coordinates, the ops select dropdownbox and the "go" button disappear and get replaced by "You don't know any agent operations."

If I go back to the spec ops page, things will be back to normal though. Just weird that it happens, and it makes it annoying to do DU a couple of times in a row on the same planet (which is what you want to do 90% of the time )