Aximmetry version 2026.2.0 (or earlier) may crash out when file operations are performed on Samba-enabled NAS devices (e.g. TrueNAS).
These operations include creating a new folder from within Aximmetry, editing a file linked in the Aximmetry project, or creating a new folder next to the Aximmetry project file.

The most likely cause is a Samba update on the NAS, which introduced a new behavior where directories are first created with a temporary internal name and then renamed to their final folder name. 
In this situation, Samba may send a Windows file system notification containing a temporary folder name similar to the following:
.::TMPNAME:D:<server/id>:Set Extension
This temporary name includes colons (:) which are valid in Linux/Unix file systems, but not in Windows paths. 
Since the SMB share is accessed from Windows, Aximmetry receives a directory rename event with an invalid Windows path and may crash while processing that event.
This is upstream Samba behavior and is enabled by default.

To work around the issue, disable this Samba feature in the relevant share configuration:
vfs mkdir use tmp name = no

Aximmetry is expected to handle this issue without crashing in version 2026.3.0 and later.