Our development team is already looking into that issue!
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Had an update this morning, and all was well until about 4pm and now the app wont open, have to keep closing the app until it will open, I have sent a feedback report
I have had this issue. I have noticed that if you open the app, rotate the device to landscape mode until the app follows suite, Twitter will open normally and then you can rotate it back to portrait no problem. A work around for the time being until a fix is sorted