I'm not sure if it qualifies as a bug, but I've just encountered a problem adding a spouse via the "connect an existing profile as her spouse" option.
Normally I'm adding a new person, and when doing so I fill in the marriage date in the dd-mmm-yyyy format, e.g. 21 Nov 1850. That's the same way I fill in dates of birth and death.
However, when I select "connect an existing profile as spouse" option, using that format issues an error, telling me I must use one of two other formats. I'm used to adding dates quickly so I blew through it the first time and wondered why the spouse hadn't been added.
Upon repeat, I entered Nov 21 1850 as instructed and it worked. And not only did it accept the data, but it then displayed it as 21 Nov 1850 - the format it refused to accept!
This seems extremely user unfriendly! I was adding a spouse for Swick-254, if that's any help to someone looking into it, but I think any profile works the same. I'd run into the same issue some while back but was very busy and didn't take the time to report it.