Incorrect html in causes error when posting image through xmlrpc..

For quite a while I have been posting to my blog happily using the xmlrpc way from my mobile phone.

For some time now I am having trouble with that and I am unable to fix it, but I can’t really say when it first appeared or if it was due to an upgrade.

When I use e.g. the WP for Android app to post a picture the result looks like this – no matter, if I create a new post or a new page.

Inspecting the page in Chrome I found out that the part of the page that actually refers to the image looks like this:
<p>img title="picture.jpg" class="alignnone" alt="image" src="https://blog.gerstacker.org/wp-content/uploads/2011/12/wpid-picture.jpg" /</p>

It works fine, if I manually change it to look like this:
<p><img title="picture.jpg" class="alignnone" alt="image" src="https://blog.gerstacker.org/wp-content/uploads/2011/12/wpid-picture.jpg" ></p>

I have disabled all plugins, changed the theme, used different xmlprc-client but the result is still the same.

I also had the problem that the quotes in this part of teh code showed up as smart quotes. I fixed that by installing the ‘Smart Quotes’ plugin – it did not fix the other issue though.

Here is more detail on the code – after my correction.

Anybody got an idea?