The 3. party applications in the quick toolbar is disappearing from time to another.

Here's a quick fix, but you then have to fix the menubars every time.
Is there an export function for the menubar and tools?

Acrobat DC installed an update and now my PitStop toolbars have disappeared. How can I fix this?
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Background:
A recent update to Adobe Acrobat DC is causing the toolbars for installed plug-ins to disappear, including PitStop Pro toolbars.

Solution:
We’ve been able to help customers fix the issue by removing all Acrobat preferences. So please note that you will have to manually set your Acrobat Preferences correctly again after the steps below.

Mac:
Close down Acrobat
Open menu Go in Finder while holding the Alt key, then choose “Library”
Open the Preferences Folder
Move the com.adobe.Acrobat.Pro.plist to the desktop (If you can’t find that, take com.adobe.Acrobat.Prox869.0.plist)
Start Acrobat, the issue should be fixed now
Restore your Acrobat preferences
Windows
Type in "regedit" in the start menu and press enter to open the registry editor
Open this path: Computer\HKEYCURRENTUSER\Software\Adobe
Right click the “Adobe Acrobat” folder and choose “Export”. You can store this backup on the desktop for example.
Right click the “Adobe Acrobat” folder and choose “Delete”. You can store this backup on the desktop for example.
Restore your Acrobat preferences
Since the issue is within Acrobat itself, we suggest that you report this bug directly to Adobe via their forum, their support chat or via their report a bug page. Be sure to include/attach the preferences that were backed-up to the desktop in the steps above.

We've received reports that the issue might appear again after completing the steps above. The only permanent solution until Adobe releases a fix is to try to downgrade Acrobat to a version which doesn't have the issue yet.
For perpetual Acrobat licenses, you can downgrade to Adobe Acrobat DC 2015.***, which is possible if you have a static license here.
If you are on a Creative Cloud subscription, then you can only downgrade a full version to Acrobat XI.
We have had reports of customers that an older version was installed after removing and reinstalling through Creative Cloud. We are not sure how long this will continue to work. When you try this, please don't forget to disable Automatic updates in Acrobat.
If none of the above works for you and you are experiencing that the issue comes back after running the workaround steps, then we advise to certainly report the issue to Adobe using the steps above to make sure the issue gets priority by Adobe.