Check with your IP (IVA people) if an interim order was obtained at court as, if granted, it precludes bankruptcy and other legal proceedings whilst the order is in force. It is, however, likely that the interim charging order in favour of Creditor A was put on before that.
Your IVA people may have also put a restriction on the title register (like Creditor A did) which says that no sale can take place without their consent (so certain creditors can't get unfair advantage, you can't sell the property cheap to prejudice other creditors etc...).
Check with them they did this is download a copy of your title for �3.00 from here to check it's on...
http://www.landregisteronline.gov.uk/
Further to my previous comments about the judge in the first hearing I am guessing (again, please check) he was dealing with the matter brought before him by the creditor and had to react within the limits of his power accordingly.
An IVA is a legally binding agreement with your creditors and can be put in place if over 75% of your creditors agree (the 75% is calculated in accordance with the money you owe). Once agreed, creditors are not allowed to add further interest or charges to your accounts by law.
Your property and any available equity in it should have been considered as a means as to whether some equity could be released in order to pay off some of the creditors.
Hope this helps :)