Menu "Paste Text" vs cmd-V

[RG Teeter]

I have a stack in which the following happens.

1. First use, cmd-v pastes text and style as expected.

2. Stack is saved.

3. New data is available.

4A. cmd-v pastes the correct text but the wrong style.

4B. Menu "Paste Text" pastes the text and style as expected.

5. Any subsequent cmd-v pastes the text and style as expected.

6. Stack is saved.

7. Go to 3.

Why does cmd-v not work in 4A ?

Any insight or workaround would be appreciated.

Thanks
RG Teeter