From time to time I see people getting caught by the issue in the title. There are no other permission based modules being used; the user has edit permission for the content type, he/she may even be the author of the node, but they get a 403 Access Denied.
Here is a possible reason why: The user does not have access to a Filter type used on one or more of the node's input fields. This can happen when someone else creates a node who has access to a certain filter that not everyone else does. Then, when the other user comes to edit the node, he/she can't.
The soultion: go to Site configuration > Input formats and make sure that the roles the indivdual has are also allowed to use the input filter that the node is using.
Hope this helps
Brian

Comments
Very helpful post
Hey, Thanks for the post, it was super helpful!
Thanks! I had this problem
Thanks! I had this problem and could not figure it out. Your advice worked.
Thanks you for posting!
for some reason image filters or something where stopping access to edit nodes, but nodes could be created.
so this helped me with my permission issue!!
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