Ok here's an update; I have 2 ARMA3 profiles, the default profile and my clan profile. I usually play with my clan profile. What I have noticed is that for my save games to appear (i.e. resume button), I either have to play using the default profile OR play the scenario with my clan profile, save and exit, switch to the default profile, play the same scenario and save and exit, then switch back to my clan profile at which point I can resume (i.e. resume button appears).

Here is how to reproduce :

Delete the Saved folder in the default profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3\Saved

Delete the Saved folder in the alternate profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3 - Other Profiles\-1PARA-hilkiah\Saved

1-Launch game
2-switch to alternate profile (if it isn't already selected)
3-start the scenario (e.g. Dsylecxi's gear menu)
4-save and exit

• at this point, here is what the Saved dir looks like on both profiles:

Default profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3\Saved\steam\dslyecxi's%20gear%20menu%20v1%2e6.altis\dslyecxi's%20gear%20menu%20v1%2e6.altis.pbo (only the pbo file)
C:\Users\HILKIAH\Dropbox\Documents\Arma 3\Saved\steam\meta\cacheItems.map,publishedContent.list,subscribedContent.list (3 files)

Alternate profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3 - Other Profiles\-1PARA-hilkiah\Saved\steam\dslyecxi's%20gear%20menu%20v1%2e6.altis\continue.Arma3Save,weapons.cfg (2 files)

• at this point there is no resume/restart option for this scenario

5-switch to default profile
6-start same scenario (e.g. Dsylecxi's gear menu)
7-save and exit

• at this point the resume/restart option is available for BOTH profiles. Also here is what the Saved dir looks like on both profiles:

Default profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3\Saved\steam\dslyecxi's%20gear%20menu%20v1%2e6.altis\dslyecxi's%20gear%20menu%20v1%2e6.altis.pbo,continue.Arma3Save,weapons.cfg (3 files)
C:\Users\HILKIAH\Dropbox\Documents\Arma 3\Saved\steam\meta\cacheItems.map,publishedContent.list,subscribedContent.list (3 files)

Alternate profile:
C:\Users\HILKIAH\Dropbox\Documents\Arma 3 - Other Profiles\-1PARA-hilkiah\Saved\steam\dslyecxi's%20gear%20menu%20v1%2e6.altis\continue.Arma3Save,weapons.cfg (2 files)

As a work around, I will simply play all scenarios with my default profile until this is fixed.

Also have this problem (v1.28 stable branch). For me it only affects Steam subscribed scenarios (i.e. Armaholic downloaded scenarios work well). Note further that I am not modifying mods (adding/deleting) between game. To reproduce :

• start Arma3
• start scenario
• save scenario
• save and exit scenario
• there is no option to resume scenario

So basically you don't even have to exit Arma3 for the problem to manifest itself. Note further that ...Documents\Arma 3\Saved\steam\scenario name... exists. So it appears that Arma3 is writing the savegame info to disk, it just isn't reading it back.

Lastly, it is not a profile issue as I am using the same profile all the time.