See "Steps to Reproduce".
Steps to Reproduce:
 Open the “Paths” options dialogue: Tools > Options… > LibreOffice > Paths
 Add a folder to the Templates paths. The folder should contain a lot of files, I used the “Program” folder of Windows.
 Close Options dialogue with OK.
 Start Template Manager: File > New > Templates. It looks like that LibreOffice hangs. After some minutes I cancelled LibreOffice without the possibility to save data.
I suppose, in this case LibreOffice scans the whole folder for templates. I don't know how long it will take in this case to scan the whole Program folder.
There are several possibilities to solve this problem:
(a) At least the user should be informed that LibreOffice is scanning specific folders for templates.
(b) Also at least cancelling the scan process should be possible.
(c) It may be reasonable to do not scan sub-folders.
(d) Possibly only folders which do not contain sub-folders could be selected in the options dialogue.
User Profile Reset: No
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:51.0) Gecko/20100101 Firefox/51.0
I'll just go wild and set this to NEW without testing. It is true that your suggestions should be considered.
IMHO, this can be considered a duplicate of bug 101467
*** This bug has been marked as a duplicate of bug 101467 ***
I checked this bug again with version 5.3.7 and 5.4.3. The bug still exists in both versions. This means either the fix of bug 101467 does not work or this is another problem. Hence I set back this bug to unconfirmed, because it has not been independently tested.
I think the probability of occurence is not very high, but if it occurs there is the danger of data loss because the user has to cancel LibreOffice after a while without saving.
Bug 101467 was about memory leaks, while Harald's suggestions are worthwhile to consider on their own. Setting back to NEW
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Bug still exists in version 6.1.4 (64 bit, Win10).