I HATE these caps!!!!!

Many times the supplies or equipments we use in the hospital may change based on availability or cost.  The newest change to hit us has been our IV connectors and IV caps.  Now usually I don't notice a difference in most things, however, I am going to be completely honest and say I HATE these new connectors and caps.
I was in the middle of starting a ridiculously hard IV when I attached the cap (we didn't have any connectors at this time).  The IV was drawing blood beautifully, however when I went to flush it, it would not flush at all.  No matter what I did, I was not able to flush the IV, which meant that I had to take the IV out.  It frustrated me a little since I knew the IV was good since it was returning blood.  Anyway I found a new spot and put in a new IV.  This time when I placed the cap on it flushed and drew beautifully.  YAY!!!  I taped it all down and hooked up the fluids.  Of course as soon as the fluids were attached and turned on, it decided it didn't want to work (I was not happy about this, thinking I was going to have to change the whole IV yet again).  I retaped the IV and did everything I could think of to make the IV work, with no success.  I finally went to a different unit and found an IV connector.  After connecting the connector and starting the fluid, it again did not want to flush.  At this point I was beyond frustrated.  A task that should have taken 15 minutes was turning into a 45 minute job.  Finally I got the bright idea to replace the cap on the end of the connector.  As soon as this was done, the IV worked like it should have.  I was so happy that I did not have to change out the IV again, especially since the patient was needing some blood pressure meds for her BP of 220/113.