No -- you are not alone. Credit Fix have, apprently, halted all variations due to creditors being unhappy with their paperwork (at least this is what they have told at least one poster here).
My suggestion that they proceed using the already agreed framework while they sort out changes away from live cases was not understood when passed on to them !
Unfortunately, IPs and Insolvency firms are pretty much fireproof (something I tried to raise a petition against, but found little support). The Financial Ombudsman says IVA's are outside of his remit, which leaves only internal complaints and complaints to their regulatory bodies via the Government Gateway: https://www.gov.uk/complain-about-insol ... actitioner
Unfortunately the regulators will not intervene in the actual conduct of the case, but will only offer a slapped wrist or a fine against the IP. Some of these fines, however, can be quite hefty, so the threat, when mentioned in an internal complaint, sometimes does the trick.