Hello, please file a bug report in Pixelorama's GitHub Issues page, with as much detail as you can, including your operating system, steps to replicate, whether this happens for all projects or not and if it doesn't, uploading a .pxo file of a project that does not get exported as a .gif would be very helpful. Also, it might be possible that if you have an anti-virus software installed, it might mess up with file exporting. Users have experienced errors exporting .png files because they had anti-virus software installed.