Using Windows 10 Pro. Office 365 downloaded onto a PC.
I'm at my wits end. I have distilled the problem to a very simple example:
1. Bound (table, not query) Main Form with Single Form View, 1 bound textbox from the same table-- any subform of any type -- as soon as you enter or edit the text in the main form's textbox, the subform becomes inaccessible as if it were locked
2. Unbound Main Form with Single Form View, 1 unbound textbox -- any subform of any type -- works fine
Popup/Modal doesn't matter, all forms & controls Enabled & Unlocked, DataEntry=No, Additions/Deletions/Edits=Yes, Master/Child gives same result whether used or not
Large split database with back and front ends.
This doesn't seem like a lock issue because the problem occurs even when the subform is not attached to any data.