Citing just a few examples...
The whole Avenger Enterprises saga was dogged by the same problem - I would ask questions to which I as a licensee was entitled to answers, and they'd go unanswered. Or require repeated proddings. Or I'd have to go through Marc's 'inner circle' who have their own agendas and will happily derail a project that is otherwise going OK because it doesn't fit their vision of what The Olde Game should look like.
Spinward Marches was derailed by mailicious interference by Hunter Gordon, acting upon unsubstantiated hearsay (which I had already stated in his own forum was groundless). Without bothering to investgate or speak to me at all, Marc Miller appointed Hunter Gordon as 'line editor' to oversee my work and vet it before submsision to Marc Miller (This was illegal since Gordon was a direct competitor; it was also insulting to me as well as being downright stupid).
The 'line editor' thing was hurriedlly withdrawn but the incident shows a shocking level of mistrust by Marc Miller towards me. And then a few months later, Marc published a set of Spinward Marches UWPS containing canon 'fixes' similar to the ones I was censured for considering. So presumably what I was considering doing wasn't so bad (and it was still at the 'let's compile a list of things to ask Marc about' stage), in which case why was I treated so badly over it?
Other approvals-stage problems occurred, until finally I put in the Living Traveller campaign outline, which included concepts that Marc had agreed I could do. The document came back from the approvals stage, ostensibly from Marc, with the same concepts vetoed in an extemely sarcastic and rude manner.
Turns out, this document did not originate with Marc at all, it was written by one of his inner circle and simply passed to me without regard to the fact that the comments were extremely insulting. Marc hadn't bothered to tell the person who was issuing these vetoes on his behalf what we'd agreed I could do, which is bad enough, but he then failed to notice that:
1. The document that came back to me had been dealt with in a manner totally unsuitable to professional interaction, and was downright rude
2. It contradicted what he had aleady agreed I could do.
I had acted upon what I was told was doable, and was now required to rewrite the campaign outline, which meant more work-time (= money) wasted on the project.
The person writing the comments responded to my protest by telling me that that's just how he writes. My reply, something along the lines of 'not to me you don't' was the beginning of the end for my involvement.