I remember I tested this manager via flag --enable-manager instead of the extension, idk, maybe 3 months ago - I had the same issue. I thought it's just a bug they will fix, because this feature is new. But no - nothing changes! I tried nuking __manager user. Doesn't work. It's always these loading placeholders with no any error message. Maybe I need to remove some other settings or some sort of cache in my ComfyUI installation?
In the photos: calculator watch Casio CA-53WF-1B, cheesiness key chain abacus, slide rule tie clip Swank; desktop calculator Casio DJ-120D Plus, cheesiness abacus, slide rule addiator Faber Castell 67/54 Rb
Coca-Cola-branded conversion slide rule and Coca-Cola-branded conversion calculator
National Semiconductor NS Model 600 is the first affordable calculator (according to LGR's video). It was released in September of 1973 for $29.99 - $213 in 2025 May money. It became cheaper over time. It has a lot of different colors - I saw this blue + brown; all blue and all brown; and all pink models on eBay. Maybe there were even more variations
It has an interesting visual design, looks more like a miniaturized 1960s desktop calculator than a 1970s calculator. Also this model is very primitive:
DECIMAL switch enables fixed little light dot on the screen and does nothing else. It allows fixed point calculations for addition and subtraction only + division and multiplication where one of the operands must be integer ignoring the decimal point= or Enter keys (PRN with only 2 registers in stack)