Problem with exporting blocs project

Up until today, I haven’t had any problem exporting my projects. However for some reason, with the exception of the following:
all output are stuck on the cloud image (see screenshot). I have tried numerous times trying to export without any luck. I have even logged out of blocs and, even doing a reboot of my mac to no avail. I have left the files as is just in case they needed more time but nothing seems to work. Can somebody suggest how I may rectify this problem please, or what is it that I am suddenly doing wrong which I have done to date to cause this?

Uploaded as is to the server and there seems to be no problem.