Cannot create a Node.js proxy, JS errors when activating CORS

[#1]

When creating a new Node.js API proxy and activating CORS, I get JS errors at the "Generating proxy..." step.

Error: c is undefined
V@https://enterprise.apigee.com/platform/scripts/8ddf157b.scripts.js:16:4276
ka.generateProxy/<@https://enterprise.apigee.com/platform/scripts/8ddf157b.scripts.js:16:11179
i@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:5:24951
j/<@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:5:25123
Wb/this.$get</n.prototype.$eval@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:6:505
Wb/this.$get</n.prototype.$digest@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:5:31016
Wb/this.$get</n.prototype.$apply@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:6:774
f/j<@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:6:8027
g@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:4:18158
Va/p.defer/c<@https://enterprise.apigee.com/platform/scripts/8af5cf44.components.js:4:20270
1 8af5cf44.components.js:5:19444
e/<() 8af5cf44.components.js:5
<anonyme> 8ddf157b.scripts.js:1
i() 8af5cf44.components.js:5
j/<() 8af5cf44.components.js:5
Wb/this.$get</n.prototype.$eval() 8af5cf44.components.js:6
Wb/this.$get</n.prototype.$digest() 8af5cf44.components.js:5
Wb/this.$get</n.prototype.$apply() 8af5cf44.components.js:6
f/j<() 8af5cf44.components.js:6
g() 8af5cf44.components.js:4
Va/p.defer/c<() 8af5cf44.components.js:4

And right after, syntax errors.

Here is a screenshot:

No network requests are made, and after 1 hour still nothing happens.

EDIT: tried with Chrome, I get this:

TypeError: Cannot read property 'preFlow' of undefined
    at V (8ddf157b.scripts.js:16)
    at 8ddf157b.scripts.js:16
    at i (8af5cf44.components.js:5)
    at 8af5cf44.components.js:5
    at n.$eval (8af5cf44.components.js:6)
    at n.$digest (8af5cf44.components.js:5)
    at n.$apply (8af5cf44.components.js:6)
    at 8af5cf44.components.js:6
    at g (8af5cf44.components.js:4)
    at 8af5cf44.components.js:4
(anonymous function) @ 8af5cf44.components.js:5