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Cannot edit filters, get flash of blue and field blanks

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Trying to edit filters and when I hit the + the field flashes blue and blank. I cancel and the field restores to previous value when I go back to edit.

Trying to edit filters and when I hit the + the field flashes blue and blank. I cancel and the field restores to previous value when I go back to edit.

Chosen solution

Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.

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Chosen Solution

Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.

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That worked, thanx, but I do not have any add ons. The only addon I had was Lighting and it was disabled. I removed it anyway. I still had the issue so I hit the button to reset toolbars and controls. The filter issue is gone. My toolbar looks different but I don't remember what disappeared :) Must not have been very important!! Another symptom was that every filter only displayed the top condition. Now they are all visible again. I cannot say exactly what the "offender" was but it is fixed now. I know TB did a recent update. I'm running 60.5.0 (64-bit) now. Thanx again.

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A theme is my guess. Apple buyers all seem to install a theme.

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I've never used a theme.