When I opened the Insagram help site, it displayed the content in my (non-English) language. I tried searching for more possible solutions, and upon encountering a content available only in English, it offered me to change the site language to English (apparently in a permanent way).
Only after that I was able to browse to this page, that as March 2013 says only:
Instagram is crashing
If your Instagram app is crashing, please file a bug report here.
And links to a facebook page with a bug report form.
There's also an email contact address at the app page on Google Play. (The address - aimed at Android users, obviously - is android-support [AT] instagram [DOT] com). However, messages sent to this addres are replyd to with an automatic message redirecting to the official help page.