The Live-API to OneDrive which is used by maaloo Geocaching/Outdoor was switched off by Microsoft.
You can still import GPX-files by direct file import. E.g. you can send an Email to yourself with an GPX file attachment. Open the attached GPX-file in your mail client on your phone. Touch on the file and all associated apps are listed which can open GPX files. Choose maaloo Geocaching/Outdoor an the file will be imported.
There are no export features available anymore. Sorry for any inconveniences caused. Ways of implementing an alternative feature to export a GPX file are checked.
Update: v188.8.131.52 – added the ability to export tracks and waypoints by export as plain text in the body of an Email. This re-enables the further post-processing and import in GPX-Editors on PC.