What behavioural problems could be saddle-related?
Many! If a horse is in pain or discomfort, the only way to communicate this to us is with behaviour and body language, which to us is often interpreted as being “bad”. It can range from subtle tail swishing and fidgeting when being saddled and girthed, to biting, kicking, napping, bolting, shying, not standing still when mounted, reluctance to work, rushing when ridden, anxiety, nervousness. Cold-backed, bridle lame, etc.