Yes, an IP license remains valid during an insolvency proceeding.
Where the debtor is the licensee, the licensor is obliged to maintain the license and perform its obligations, unless the license is disclaimed. Absent a disclaimer, the licensor is entitled to payment for the continued use of the licensed property after the event of insolvency and will have a claim for any pre-insolvency arrears. If the license is disclaimed, the licensor will also have a claim to any damages suffered.
Where the debtor is the licensor and either disclaims a license agreement or sells the underlying IP, the non-defaulting licensee(s) will continue to have the right to use the IP during and after the insolvency proceedings. The licensee may have a damage claim, as well.