We have a few reports about the issue with launching GP 3.0 where it starts and hangs at the splash image (other symptoms are also possible)
This may be caused by a missing update which was skipped. Unfortunately, due to a bug in the update system, the update which was skipped won’t be install afterwards, even if subsequent updates depend on it.
Updates location on disk
The workaround which fixes such issues is to remove all installed updates from disk. Normally the updates sit in the folder
~/.ganttproject.d/updates in the user’s home folder.
Removing the updates
On macOS and Linux, one can remove the updates by running the following command in Terminal:
rm -rf ~/.ganttproject.d/updates
On Windows one can find and remove
.ganttproject.d. folder in the user’s home folder using their favorite file manager. The user home folder on the modern Windows systems is normally
C:\Users\<your user name here>.
Please pay attention to the leading dot in the folder name. Some file managers may hide such folders.
After removing the updates, launch GP 3.0 and let it install all updates. This should fix the issue.