Debugger lists everything as "<unknown instance>"

[KH-SOS]

So something I did this afternoon has ruined debugger. I've been working on this project for months, it's looking really good and I'm going to show it at a convention next weekend, but all of a sudden debugger is acting up.
Now when I run the project in debug the debugger lists every instance in the room (except for oHero - the main player object) as <unknown instance>. I can still click on them and drill down to find variable data, but as you might imagine, it's a tremendous pain in the neck trying to find what you want.

Has anyone seen this behaviour before? Any ideas what caused it/how to fix it?

 

[Ito]

I have this same problem, and it's happening on GMS2 as well.

 

[Jabbers]

Bump for help.

I randomly got this problem for the first time ever this week. I'm on an old version of Studio, 1.4.1757. It makes debugging an absolute nightmare.

UPDATE: results of my testes

• Using latest EA doesn't fix it
• Reinstalling GM doesn't fix it
• Exporting project to a new project doesn't fix it
• Resaving project to a new project doesn't fix it
• Using an old backup of my game fixed the issue, it seems to be project specific
• Comparing the files with WinMerge showed no obvious differences, I didn't do a thorough search but the only change was some new resources that I added since the last backup
• Clearing cache doesn't fix it
• Clearing temp doesn't fix it

EDIT2: okay so a temporary solution could be to run code like this

with(all)
{
    name = object_get_name(object_index);
}

When run it will create a variable for all existing objects that will show the resource name of the object. It is less convenient, but it means you won't have to guess what object you are looking at based on the variables it possess. It is still better than nothing for now.