Problem on tickets : product disappears when saving form

Hello,
We have a problem when saving ticket form : the selected product is not saved
Steps :
- Modify ticket
- Select product + modify description for example
- Save ticket
- Open an other ticket
- Reopen the first ticket => the product is empty (modification of description is ok)

See attached screenshots :
Screenshot1 : before clic on "Save" icon
Screenshot2 : after reopen

There is no error in log file.
Projeqtor version : 5.3.5 (same problem with 5.3.3)
Browser : firefox 47.0 (same problem with Chrome)

Thanks

Thanks Babynus for your answer.
There is no error in Projeqtor log file, neither in browser console.
It seems like product isn't saved. When we re-open the ticket, the previously selected product is not in the list.
We will make a test with v5.4 at the end of august. We will tell you the result after the test.

Same problem with v5.4.
Nevertheless, we found a workaround : if a version is selected on the project, the product is saved on the ticket.
So, at least one version must be selected on a project if you want to select a product in a ticket.

The problem occurs only when we use the "magnifying glass" icon to select a product. This icon is displayed with administrator profil.
This profil is not available in demo.

I can try to explain with more precision the way to reproduce the problem :
- connect with admin user
- create a ticket
- choose a project with no version
- use the "magnifying glass" icon to select a product
- save
- close
- reopen => no more product (product is not saved)