As subject line. It used to save them, but not any more. You rename and click the disk/save button, but it does not save it. I cannot see it in the drop down. Is it me or do I have an issue?
I then change the text etc and rename the preset, click the disk/save icon and then it cannot be found either in the main Titles & Text or the drop down menu.
Don't know if it matters but are you using the latest VMS 15 Platinum build 116? My custom presets were made there using the standard procedure you mention ("Adjust the settings, Type a name in the Preset box, Click the Save Preset button"). You might try resetting to "Delete all cached application data".
It's an unusual problem that I have not read of before. I suggest you submit a support request at https://support2.magix.com/customer/en/vegas/form , including as much detailed information about the problem as you can.
This kind of issues may stem from a DLL mismatch - a old but apparently compatible library is found in the path before the right one. You could try to deinstall everything and scour the system for any leftover directory or library, then reinstall the software you want. Alternatively, you can use one of the many utilities to dump which DLLs the Movie Studio executable uses and see if you have some old versions laying about in any directory in the PATH environment variable.