yup. Been injecting into glutes for countless times and just last week had one that virtually crippled me. Started in the upper glutes (far away from the inj site oddly) and went into my tailbone/lower back.
Scared me into trying new sites. Still don't know what happened. I work sterile, the inject itself was painless as usual, but the soreness crept in on day three and peaked a week later. Could barely get into and out of my car. Took a week to recover from.
Sometimes it just happens, I guess.
But avoid NSAIDS such as ibuprophen even though they are the best at pain relief and swelling. Studies have shown that they slow the healing of the muscle. Only real painkillers and light duty help to heal it properly and quickly.