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It only stops during the draft. There isn't a particular date for it to be turned off, just "during the rookie draft." 

C. Off-season Free Agency Period
1. Each team may protect up to 40 players and list no more than eight restricted free agents (RFA). Owners must cut their roster to no more than 48 players by the deadline to designate RFA's.
2. The deadline to designate restricted free agents is 11:59PM ET two days before the NFL League Year. (e.g. if the NFL Year begins at 4PM ET on March 18, our FA designations are due at 11:59PM ET on March 16). Any team that misses this deadline will have their free agents designated by the syndicate czar.
3. The Zealots off-season free agency period will start on the same day as the start of the new NFL League Year, at a time determined by the commissioner, provided setup of the MFL site is complete.
4. The off-season free agency period is not permitted to start unless all twelve franchises have owners and all owners have paid. Commissioners must receive approval from their Czar to begin the RFA period. Czars will confirm leagues are paid in full with the appropriate posts in the Bank & Trust forum.
5. If the team of origin does not win the auction for one of their RFA they will be awarded the winning amount in ZBs. Commissioners are expected to update the accounting at the MFL site within 48 hours of the completion of an auction.
6. Any auction on a RFA must be started within 4 weeks of the off-season free agency period starting for the original owner to receive ZB compensation.
7. Free Agent auctions are available from the start of off-season free agency until 11:59PM ET on the Tuesday after the last Preseason Week 3 game with two exceptions. Auctions will be turned off to convert MFL sites to the following year and during the Zealots rookie draft. Any auction that begins during this time frame will be permitted to finish.
8. Player Eligibility
a. Auctions cannot be started on players who will be rookies for the upcoming season until after the completion of the Zealots annual rookie draft.
b. Players in the NFL Supplemental Draft become free agents at ZFL at the completion of the Supplemental Draft.
c. All other players listed in the MFL player database are eligible for auctions
d. Players not listed in the MFL player database are eligible for off-season auctions under the following conditions:
i. The player has been signed to a contract with an NFL franchise, and that contract can be verified through legitimate news outlets (ESPN, NFL.com, Rotoworld, official team site, etc). In the event of a dispute, the Zealots Field Staff will be responsible for deciding the validity of the news source.
ii. An owner must request that the commissioner enter the player as a custom player in the league's site. Using an existing player as a proxy for the player that is not in the database is not allowed.
 

Well, there is certainly a lot of disagreement among members of leadership regarding the ambiguity of the wording of #7 above. Classic and PPR rookie drafts are starting from April 30 through May 17, and this rule offers no guidance for commissioners as to when exactly they should disable the ability to start a new auction. After being questioned by THREE members of Classic 6, I talked to Steve and we decided to turn them off. Of course, by the time you read this,our draft is over, and now they are back on! I hope your draft was solid, and good luck with acquiring undrafted rookies! Let me know when you want your old job back, I am still just "filling in" since no one else wanted to step up and take over! Either way, glad to have you back in the league. 

Jack