MS Access 2016 accdb file not opening forms on a different PC

I am working with a .Net developer to create a DLL that I reference from my MS Access application.  To help testing, I created a very basic Access 2016 db with a couple of forms and a module that will contain all of the code.  However, when I send him the .accdb file, the startup form does not load.  Plus, he can only go into Layout and Design view of the forms.  The odd thing is that he can open the module and run the test functions just fine (either from the Immediate window or directly).

He doesn't get any security warnings, it's pretty much the same version (slightly different revision), our security settings seem similar (we have compared Trust-center settings and added his location) - but nothing - the forms will not open normally.  Also, there are no compile errors.

I'm sure it's something to do with security  - I'm just not able to see the fix at the moment.

Any ideas would be very much appreciated.
Andy BrownDeveloperAsked:
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
um....what is he opening it with?

Jim.
Andy BrownDeveloperAuthor Commented:
Hi Jim - hope you are well.  Not sure what you mean.  He has Office 365 / Access 2016.
Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
Life is good thanks.

He has Office 365 / Access 2016.

 That's what I meant.

 I can't think of anything off-hand, other than he should try disabling his anti-virus.

 If that doesn't work, then I would suspect the office install.   Have him:

1. Open Access.
2. Create a new DB
3. Create a form and save it.
4. see if he can open the form normally.

If he can do that, I'll have to think about this some more.

Jim.
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Andy BrownDeveloperAuthor Commented:
Let me try that.

Thanks Jim.
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Also be sure he's got the database in a Trusted Location.
Andy BrownDeveloperAuthor Commented:
Thanks Scott - we have checked that, but I'll get him to double check.
Andy BrownDeveloperAuthor Commented:
It turned out that it was the Access db causing the issue.  I rebuilt the test app from scratch on my PC, sent it over and everything worked.  I think the issue was down to 1 or 2 things:

*  Playing with different dll references.
* Calling the event by using =FunctionName("1") .

Either way - we're good.

Thanks for all of your help as always.

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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
Ah references....the bane of VBA.

 I really wished they (Microsoft) had addressed that.   I don't think we'll ever see a change there though :(

Jim.
Andy BrownDeveloperAuthor Commented:
I hear you.....
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