I have just retested to see if I could reproduce the problems you describe in 4 different forms that where created using validation toolkit 2.3.2 then edited using 2.3.5. Unfortunately, I am not able to reproduce a problems.
in my latest attempt, I created a form in an asp page with 4 text fields. Using the Client Validation wizard, I applied Required / Not Blank Validation to all for of them.
I tested the page and validation worked correctly.
I then uninstalled 2.3.2 and installed 2.3.5.
Using the validation wizard, I applied Alpha Numeric Validation to the first 2 fields.
I tested the page and validation worked as expected.
I am attaching a copy of the page with validation 2.3.2 and 2.3.5.
If there is a problem in Validation toolkit, we very much want to fix the issue, perhaps you could provide the steps you followed to produce the problem?
If a form is added or removed then validation will need to be reapplied. The change to using the forms collection was made to be in line with the XHTML Strict document type. In XHTML Strict, the forms name element is deprecated, forms cannot have a name.