One festering cause of flow blockages is resentment. I say festering because it is something that can linger for a long time and never be resolved. In flow you are your most successful, so there is no need for resentment at any time. If resentment does pop up, it is a clear warning that something is wrong.
Sometimes it can be a “good warning” that immediately advises you to remedy the blockages. For example, although I seldom feel resentment I do instantly get the feeling when someone has wronged me over money. Case in point: A few years ago I was working with a business partner who owed me money. He sent a check that was $3,000 short. I called him up and queried about it, and he told me he “forgot” but refused to pay. Well, resentment immediately built up and I took action and remedied the situation. My flow would simply not let this issue stay unresolved. I found out later on this guy was a crystal meth addict and was high most of the time, which explained his bizarre behavior.
Some things can’t be resolved as easily. If you had resentment towards a parent and then that parent dies you have no way of fixing the issue in person. But the resentment will prevent your flow, so you need to reconcile your resentment and move on after resolving it. And, of course, oftentimes the resentment has nothing to do with the other person, but with your own flow issues.