It really depends on the specific circumstances. However, as much as you may want to take matters into your own hands, you really should continue to work with your ex-spouse as much and as best as possible. Failing to do so could result in a violation of a court order, which could cause significant legal ramifications. For example, if your ex-spouse is always late in returning your children after weekend visitation, then you may want to try talking to him or her first before making any legal moves. It could be as simple as your ex-spouse wasn't aware that his or her tardiness was so important.
However, there are instances where child custody or visitation is interfered with in a way that may need to be addressed. For example, if your ex-spouse tries to move away with your children without permission from the court, then you may want to consider your legal options to stop the move. As with all child custody determinations, these matters are often settled with the best interests of the child in mind which may or may not play into your favor.
It is worth noting that if a child is older when these issues arise, then a court may give more weight to his or her preference. Therefore, if your child is 16-years-old and decides he wants to live with his other parent, that will have great influence on a judge's decision. It may not even matter that it appears that your child's other parent is bribing him or her to change living arrangements. In fact, it may be in your child's best interests.
As can be seen, there are a variety of child custody and visitation issues that must be addressed on a case-by-case basis. Sometimes an agreement modification is justified, and sometimes it is not. Therefore, it is often wise to talk these matters out with an experienced Ohio family law attorney to get a feel for where you and your case stands.
Source: FindLaw, "Custody or Visitation Interference," accessed on April 27, 2015