Could not edit posts

Yesterday I could not edit the text of my initial post in this thread:

https://www.electro-tech-online.com...utput-offset-compensation.127783/#post1062526.

Intention was to replace the attached circuit.

While I managed to eliminate the original one, I could not complete the process to show the right one.

Simply I could no complete the preview process. (Sorry I did not copy the error message).

I finally opted to post it somewhere below.

When somebody found an apparent mistake in my second circuit I decided to replace it again.

This time I did different: uploaded the new (good) one and immediately deleted the old (bad) one. No preview and save changes. Worked OK.

I know this does not answer your question but in general it is better to leave the old in place and provide the new circuit in a new reply. Doing so preserves the flow of the thread.