For the sandboxes of one particular org, I notice that as soon as I start editing an active trigger, via the standard editor in the browser, the trigger is marked as inactive in the editor. I have to manually click the check box to make it active again. Fortunately, the version of the trigger that is live is still active. However, should I forget to manually click the check box, before clicking Save, the trigger is indeed made inactive. This has caused some headaches before I found out what was going on.
I have noticed this behavior only for the sandboxes for this particular org, for other orgs it doesn't do this. The behavior is consistent: it's happening for each active trigger that I start editing. Googling hasn't brought up anything. Anyone who has seen this before and knows how to prevent this annoying behavior?