Just a tip for those of you persistently having problems - Do you have a "Limited" Steam Account or an "unlocked" one? From what I understand, you now need to spend around $5 directly with Steam (buying games or adding $5 to wallet) to unlock certain features one of which is being able to control visibility of your Steam profile (needed for GOG Connect to continue to "see" it after Steam recently made profile visibility disabled by default):- https://support.steampowered.com/kb_article.php?ref=3330-IAGK-7663&l=english
I had similar problems in that GOG Connect used to work but ever since Steam changed their policy, my Limited Steam account (mostly Humble purchases and freebies) was no longer visible by GOG during the last sale's GOG Connect. Since then I paid the equivalent of $5 buying a few DRM-Free games on it (eg, Portal 1), I could suddenly access a lot more settings and during this GOG sale, GOG Connect started working again. Just something to bear in mind for those of you with Steam accounts who've never spent more than $5 directly with Steam and found GOG Connect stopped working sometime last year when Steam changed their policy to "default hidden" - lack of control over its visibility by Limited accounts will impact GOG Connect.
Thanks for your help. Support was able to help me by refreshing the GOG connect. Maybe your advice will help others. I am always amazed how helpful the GOG community is whenever somebody needs help so thank you again!